/* * drm_sysfs.c - Modifications to drm_sysfs_class.c to support * extra sysfs attribute from DRM. Normal drm_sysfs_class * does not allow adding attributes. * * Copyright (c) 2004 Jon Smirl <jonsmirl@gmail.com> * Copyright (c) 2003-2004 Greg Kroah-Hartman <greg@kroah.com> * Copyright (c) 2003-2004 IBM Corp. * * This file is released under the GPLv2 * */ #include <linux/device.h>#include <linux/kdev_t.h>#include <linux/gfp.h>#include <linux/err.h>#include <linux/export.h> #include <drm/drm_sysfs.h>#include <drm/drm_core.h>#include <drm/drmP.h> #define to_drm_minor(d) dev_get_drvdata(d)#define to_drm_connector(d) dev_get_drvdata(d) static struct device_type drm_sysfs_device_minor = { .name = "drm_minor"}; /** * __drm_class_suspend - internal DRM class suspend routine * @dev: Linux device to suspend * @state: power state to enter * * Just figures out what the actual struct drm_device associated with * @dev is and calls its suspend hook, if present. */static int __drm_class_suspend(struct device *dev, pm_message_t state){ if (dev->type == &drm_sysfs_device_minor) { struct drm_minor *drm_minor = to_drm_minor(dev); struct drm_device *drm_dev = drm_minor->dev; if (drm_minor->type == DRM_MINOR_LEGACY && !drm_core_check_feature(drm_dev, DRIVER_MODESET) && drm_dev->driver->suspend) return drm_dev->driver->suspend(drm_dev, state); } return 0;} /** * drm_class_suspend - internal DRM class suspend hook. Simply calls * __drm_class_suspend() with the correct pm state. * @dev: Linux device to suspend */static int drm_class_suspend(struct device *dev){ return __drm_class_suspend(dev, PMSG_SUSPEND);} /** * drm_class_freeze - internal DRM class freeze hook. Simply calls * __drm_class_suspend() with the correct pm state. * @dev: Linux device to freeze */static int drm_class_freeze(struct device *dev){ return __drm_class_suspend(dev, PMSG_FREEZE);} /** * drm_class_resume - DRM class resume hook * @dev: Linux device to resume * * Just figures out what the actual struct drm_device associated with * @dev is and calls its resume hook, if present. */static int drm_class_resume(struct device *dev){ if (dev->type == &drm_sysfs_device_minor) { struct drm_minor *drm_minor = to_drm_minor(dev); struct drm_device *drm_dev = drm_minor->dev; if (drm_minor->type == DRM_MINOR_LEGACY && !drm_core_check_feature(drm_dev, DRIVER_MODESET) && drm_dev->driver->resume) return drm_dev->driver->resume(drm_dev); } return 0;} static const struct dev_pm_ops drm_class_dev_pm_ops = { .suspend = drm_class_suspend, .resume = drm_class_resume, .freeze = drm_class_freeze,}; static char *drm_devnode(struct device *dev, umode_t *mode){ return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));} static CLASS_ATTR_STRING(version, S_IRUGO, CORE_NAME " " __stringify(CORE_MAJOR) "." __stringify(CORE_MINOR) "." __stringify(CORE_PATCHLEVEL) " " CORE_DATE); /** * drm_sysfs_create - create a struct drm_sysfs_class structure * @owner: pointer to the module that is to "own" this struct drm_sysfs_class * @name: pointer to a string for the name of this class. * * This is used to create DRM class pointer that can then be used * in calls to drm_sysfs_device_add(). * * Note, the pointer created here is to be destroyed when finished by making a * call to drm_sysfs_destroy(). */struct class *drm_sysfs_create(struct module *owner, char *name){ struct class *class; int err; class = class_create(owner, name); if (IS_ERR(class)) { err = PTR_ERR(class); goto err_out; } class->pm = &drm_class_dev_pm_ops; err = class_create_file(class, &class_attr_version.attr); if (err) goto err_out_class; class->devnode = drm_devnode; return class; err_out_class: class_destroy(class);err_out: return ERR_PTR(err);} /** * drm_sysfs_destroy - destroys DRM class * * Destroy the DRM device class. */void drm_sysfs_destroy(void){ if ((drm_class == NULL) || (IS_ERR(drm_class))) return; class_remove_file(drm_class, &class_attr_version.attr); class_destroy(drm_class); drm_class = NULL;} /* * Connector properties */static ssize_t status_show(struct device *device, struct device_attribute *attr, char *buf){ struct drm_connector *connector = to_drm_connector(device); enum drm_connector_status status; int ret; ret = mutex_lock_interruptible(&connector->dev->mode_config.mutex); if (ret) return ret; status = connector->funcs->detect(connector, true); mutex_unlock(&connector->dev->mode_config.mutex); return snprintf(buf, PAGE_SIZE, "%s\n", drm_get_connector_status_name(status));} static ssize_t dpms_show(struct device *device, struct device_attribute *attr, char *buf){ struct drm_connector *connector = to_drm_connector(device); struct drm_device *dev = connector->dev; uint64_t dpms_status; int ret; ret = drm_object_property_get_value(&connector->base, dev->mode_config.dpms_property, &dpms_status); if (ret) return 0; return snprintf(buf, PAGE_SIZE, "%s\n", drm_get_dpms_name((int)dpms_status));} static ssize_t enabled_show(struct device *device, struct device_attribute *attr, char *buf){ struct drm_connector *connector = to_drm_connector(device); return snprintf(buf, PAGE_SIZE, "%s\n", connector->encoder ? "enabled" : "disabled");} static ssize_t edid_show(struct file *filp, struct kobject *kobj, struct bin_attribute *attr, char *buf, loff_t off, size_t count){ struct device *connector_dev = container_of(kobj, struct device, kobj); struct drm_connector *connector = to_drm_connector(connector_dev); unsigned char *edid; size_t size; if (!connector->edid_blob_ptr) return 0; edid = connector->edid_blob_ptr->data; size = connector->edid_blob_ptr->length; if (!edid) return 0; if (off >= size) return 0; if (off + count > size) count = size - off; memcpy(buf, edid + off, count); return count;} static ssize_t modes_show(struct device *device, struct device_attribute *attr, char *buf){ struct drm_connector *connector = to_drm_connector(device); struct drm_display_mode *mode; int written = 0; list_for_each_entry(mode, &connector->modes, head) { written += snprintf(buf + written, PAGE_SIZE - written, "%s\n", mode->name); } return written;} static ssize_t subconnector_show(struct device *device, struct device_attribute *attr, char *buf){ struct drm_connector *connector = to_drm_connector(device); struct drm_device *dev = connector->dev; struct drm_property *prop = NULL; uint64_t subconnector; int is_tv = 0; int ret; switch (connector->connector_type) { case DRM_MODE_CONNECTOR_DVII: prop = dev->mode_config.dvi_i_subconnector_property; break; case DRM_MODE_CONNECTOR_Composite: case DRM_MODE_CONNECTOR_SVIDEO: case DRM_MODE_CONNECTOR_Component: case DRM_MODE_CONNECTOR_TV: prop = dev->mode_config.tv_subconnector_property; is_tv = 1; break; default: DRM_ERROR("Wrong connector type for this property\n"); return 0; } if (!prop) { DRM_ERROR("Unable to find subconnector property\n"); return 0; } ret = drm_object_property_get_value(&connector->base, prop, &subconnector); if (ret) return 0; return snprintf(buf, PAGE_SIZE, "%s", is_tv ? drm_get_tv_subconnector_name((int)subconnector) : drm_get_dvi_i_subconnector_name((int)subconnector));} static ssize_t select_subconnector_show(struct device *device, struct device_attribute *attr, char *buf){ struct drm_connector *connector = to_drm_connector(device); struct drm_device *dev = connector->dev; struct drm_property *prop = NULL; uint64_t subconnector; int is_tv = 0; int ret; switch (connector->connector_type) { case DRM_MODE_CONNECTOR_DVII: prop = dev->mode_config.dvi_i_select_subconnector_property; break; case DRM_MODE_CONNECTOR_Composite: case DRM_MODE_CONNECTOR_SVIDEO: case DRM_MODE_CONNECTOR_Component: case DRM_MODE_CONNECTOR_TV: prop = dev->mode_config.tv_select_subconnector_property; is_tv = 1; break; default: DRM_ERROR("Wrong connector type for this property\n"); return 0; } if (!prop) { DRM_ERROR("Unable to find select subconnector property\n"); return 0; } ret = drm_object_property_get_value(&connector->base, prop, &subconnector); if (ret) return 0; return snprintf(buf, PAGE_SIZE, "%s", is_tv ? drm_get_tv_select_name((int)subconnector) : drm_get_dvi_i_select_name((int)subconnector));} static struct device_attribute connector_attrs[] = { __ATTR_RO(status), __ATTR_RO(enabled), __ATTR_RO(dpms), __ATTR_RO(modes),}; /* These attributes are for both DVI-I connectors and all types of tv-out. */static struct device_attribute connector_attrs_opt1[] = { __ATTR_RO(subconnector), __ATTR_RO(select_subconnector),}; static struct bin_attribute edid_attr = { .attr.name = "edid", .attr.mode = 0444, .size = 0, .read = edid_show,}; /** * drm_sysfs_connector_add - add a connector to sysfs * @connector: connector to add * * Create a connector device in sysfs, along with its associated connector * properties (so far, connection status, dpms, mode list & edid) and * generate a hotplug event so userspace knows there's a new connector * available. */int drm_sysfs_connector_add(struct drm_connector *connector){ struct drm_device *dev = connector->dev; int attr_cnt = 0; int opt_cnt = 0; int i; int ret; if (connector->kdev) return 0; connector->kdev = device_create(drm_class, dev->primary->kdev, 0, connector, "card%d-%s", dev->primary->index, drm_get_connector_name(connector)); DRM_DEBUG("adding \"%s\" to sysfs\n", drm_get_connector_name(connector)); if (IS_ERR(connector->kdev)) { DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev)); ret = PTR_ERR(connector->kdev); goto out; } /* Standard attributes */ for (attr_cnt = 0; attr_cnt < ARRAY_SIZE(connector_attrs); attr_cnt++) { ret = device_create_file(connector->kdev, &connector_attrs[attr_cnt]); if (ret) goto err_out_files; } /* Optional attributes */ /* * In the long run it maybe a good idea to make one set of * optionals per connector type. */ switch (connector->connector_type) { case DRM_MODE_CONNECTOR_DVII: case DRM_MODE_CONNECTOR_Composite: case DRM_MODE_CONNECTOR_SVIDEO: case DRM_MODE_CONNECTOR_Component: case DRM_MODE_CONNECTOR_TV: for (opt_cnt = 0; opt_cnt < ARRAY_SIZE(connector_attrs_opt1); opt_cnt++) { ret = device_create_file(connector->kdev, &connector_attrs_opt1[opt_cnt]); if (ret) goto err_out_files; } break; default: break; } ret = sysfs_create_bin_file(&connector->kdev->kobj, &edid_attr); if (ret) goto err_out_files; /* Let userspace know we have a new connector */ drm_sysfs_hotplug_event(dev); return 0; err_out_files: for (i = 0; i < opt_cnt; i++) device_remove_file(connector->kdev, &connector_attrs_opt1[i]); for (i = 0; i < attr_cnt; i++) device_remove_file(connector->kdev, &connector_attrs[i]); device_unregister(connector->kdev); out: return ret;}EXPORT_SYMBOL(drm_sysfs_connector_add); /** * drm_sysfs_connector_remove - remove an connector device from sysfs * @connector: connector to remove * * Remove @connector and its associated attributes from sysfs. Note that * the device model core will take care of sending the "remove" uevent * at this time, so we don't need to do it. * * Note: * This routine should only be called if the connector was previously * successfully registered. If @connector hasn't been registered yet, * you'll likely see a panic somewhere deep in sysfs code when called. */void drm_sysfs_connector_remove(struct drm_connector *connector){ int i; if (!connector->kdev) return; DRM_DEBUG("removing \"%s\" from sysfs\n", drm_get_connector_name(connector)); for (i = 0; i < ARRAY_SIZE(connector_attrs); i++) device_remove_file(connector->kdev, &connector_attrs[i]); sysfs_remove_bin_file(&connector->kdev->kobj, &edid_attr); device_unregister(connector->kdev); connector->kdev = NULL;}EXPORT_SYMBOL(drm_sysfs_connector_remove); /** * drm_sysfs_hotplug_event - generate a DRM uevent * @dev: DRM device * * Send a uevent for the DRM device specified by @dev. Currently we only * set HOTPLUG=1 in the uevent environment, but this could be expanded to * deal with other types of events. */void drm_sysfs_hotplug_event(struct drm_device *dev){ char *event_string = "HOTPLUG=1"; char *envp[] = { event_string, NULL }; DRM_DEBUG("generating hotplug event\n"); kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);}EXPORT_SYMBOL(drm_sysfs_hotplug_event); static void drm_sysfs_release(struct device *dev){ kfree(dev);} /** * drm_sysfs_device_add - adds a class device to sysfs for a character driver * @dev: DRM device to be added * @head: DRM head in questionLines 1–500 of 587. Load more
/* * drm_sysfs.c - Modifications to drm_sysfs_class.c to support * extra sysfs attribute from DRM. Normal drm_sysfs_class * does not allow adding attributes. * * Copyright (c) 2004 Jon Smirl <jonsmirl@gmail.com> * Copyright (c) 2003-2004 Greg Kroah-Hartman <greg@kroah.com> * Copyright (c) 2003-2004 IBM Corp. * * This file is released under the GPLv2 * */ #include <linux/device.h> #include <linux/kdev_t.h> #include <linux/gfp.h> #include <linux/err.h> #include <linux/export.h> #include <drm/drm_sysfs.h> #include <drm/drm_core.h> #include <drm/drmP.h> #define to_drm_minor(d) dev_get_drvdata(d) #define to_drm_connector(d) dev_get_drvdata(d) static struct device_type drm_sysfs_device_minor = { .name = "drm_minor" }; /** * __drm_class_suspend - internal DRM class suspend routine * @dev: Linux device to suspend * @state: power state to enter * * Just figures out what the actual struct drm_device associated with * @dev is and calls its suspend hook, if present. */ static int __drm_class_suspend(struct device *dev, pm_message_t state) { if (dev->type == &drm_sysfs_device_minor) { struct drm_minor *drm_minor = to_drm_minor(dev); struct drm_device *drm_dev = drm_minor->dev; if (drm_minor->type == DRM_MINOR_LEGACY && !drm_core_check_feature(drm_dev, DRIVER_MODESET) && drm_dev->driver->suspend) return drm_dev->driver->suspend(drm_dev, state); } return 0; } /** * drm_class_suspend - internal DRM class suspend hook. Simply calls * __drm_class_suspend() with the correct pm state. * @dev: Linux device to suspend */ static int drm_class_suspend(struct device *dev) { return __drm_class_suspend(dev, PMSG_SUSPEND); } /** * drm_class_freeze - internal DRM class freeze hook. Simply calls * __drm_class_suspend() with the correct pm state. * @dev: Linux device to freeze */ static int drm_class_freeze(struct device *dev) { return __drm_class_suspend(dev, PMSG_FREEZE); } /** * drm_class_resume - DRM class resume hook * @dev: Linux device to resume * * Just figures out what the actual struct drm_device associated with * @dev is and calls its resume hook, if present. */ static int drm_class_resume(struct device *dev) { if (dev->type == &drm_sysfs_device_minor) { struct drm_minor *drm_minor = to_drm_minor(dev); struct drm_device *drm_dev = drm_minor->dev; if (drm_minor->type == DRM_MINOR_LEGACY && !drm_core_check_feature(drm_dev, DRIVER_MODESET) && drm_dev->driver->resume) return drm_dev->driver->resume(drm_dev); } return 0; } static const struct dev_pm_ops drm_class_dev_pm_ops = { .suspend = drm_class_suspend, .resume = drm_class_resume, .freeze = drm_class_freeze, }; static char *drm_devnode(struct device *dev, umode_t *mode) { return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev)); } static CLASS_ATTR_STRING(version, S_IRUGO, CORE_NAME " " __stringify(CORE_MAJOR) "." __stringify(CORE_MINOR) "." __stringify(CORE_PATCHLEVEL) " " CORE_DATE); /** * drm_sysfs_create - create a struct drm_sysfs_class structure * @owner: pointer to the module that is to "own" this struct drm_sysfs_class * @name: pointer to a string for the name of this class. * * This is used to create DRM class pointer that can then be used * in calls to drm_sysfs_device_add(). * * Note, the pointer created here is to be destroyed when finished by making a * call to drm_sysfs_destroy(). */ struct class *drm_sysfs_create(struct module *owner, char *name) { struct class *class; int err; class = class_create(owner, name); if (IS_ERR(class)) { err = PTR_ERR(class); goto err_out; } class->pm = &drm_class_dev_pm_ops; err = class_create_file(class, &class_attr_version.attr); if (err) goto err_out_class; class->devnode = drm_devnode; return class; err_out_class: class_destroy(class); err_out: return ERR_PTR(err); } /** * drm_sysfs_destroy - destroys DRM class * * Destroy the DRM device class. */ void drm_sysfs_destroy(void) { if ((drm_class == NULL) || (IS_ERR(drm_class))) return; class_remove_file(drm_class, &class_attr_version.attr); class_destroy(drm_class); drm_class = NULL; } /* * Connector properties */ static ssize_t status_show(struct device *device, struct device_attribute *attr, char *buf) { struct drm_connector *connector = to_drm_connector(device); enum drm_connector_status status; int ret; ret = mutex_lock_interruptible(&connector->dev->mode_config.mutex); if (ret) return ret; status = connector->funcs->detect(connector, true); mutex_unlock(&connector->dev->mode_config.mutex); return snprintf(buf, PAGE_SIZE, "%s\n", drm_get_connector_status_name(status)); } static ssize_t dpms_show(struct device *device, struct device_attribute *attr, char *buf) { struct drm_connector *connector = to_drm_connector(device); struct drm_device *dev = connector->dev; uint64_t dpms_status; int ret; ret = drm_object_property_get_value(&connector->base, dev->mode_config.dpms_property, &dpms_status); if (ret) return 0; return snprintf(buf, PAGE_SIZE, "%s\n", drm_get_dpms_name((int)dpms_status)); } static ssize_t enabled_show(struct device *device, struct device_attribute *attr, char *buf) { struct drm_connector *connector = to_drm_connector(device); return snprintf(buf, PAGE_SIZE, "%s\n", connector->encoder ? "enabled" : "disabled"); } static ssize_t edid_show(struct file *filp, struct kobject *kobj, struct bin_attribute *attr, char *buf, loff_t off, size_t count) { struct device *connector_dev = container_of(kobj, struct device, kobj); struct drm_connector *connector = to_drm_connector(connector_dev); unsigned char *edid; size_t size; if (!connector->edid_blob_ptr) return 0; edid = connector->edid_blob_ptr->data; size = connector->edid_blob_ptr->length; if (!edid) return 0; if (off >= size) return 0; if (off + count > size) count = size - off; memcpy(buf, edid + off, count); return count; } static ssize_t modes_show(struct device *device, struct device_attribute *attr, char *buf) { struct drm_connector *connector = to_drm_connector(device); struct drm_display_mode *mode; int written = 0; list_for_each_entry(mode, &connector->modes, head) { written += snprintf(buf + written, PAGE_SIZE - written, "%s\n", mode->name); } return written; } static ssize_t subconnector_show(struct device *device, struct device_attribute *attr, char *buf) { struct drm_connector *connector = to_drm_connector(device); struct drm_device *dev = connector->dev; struct drm_property *prop = NULL; uint64_t subconnector; int is_tv = 0; int ret; switch (connector->connector_type) { case DRM_MODE_CONNECTOR_DVII: prop = dev->mode_config.dvi_i_subconnector_property; break; case DRM_MODE_CONNECTOR_Composite: case DRM_MODE_CONNECTOR_SVIDEO: case DRM_MODE_CONNECTOR_Component: case DRM_MODE_CONNECTOR_TV: prop = dev->mode_config.tv_subconnector_property; is_tv = 1; break; default: DRM_ERROR("Wrong connector type for this property\n"); return 0; } if (!prop) { DRM_ERROR("Unable to find subconnector property\n"); return 0; } ret = drm_object_property_get_value(&connector->base, prop, &subconnector); if (ret) return 0; return snprintf(buf, PAGE_SIZE, "%s", is_tv ? drm_get_tv_subconnector_name((int)subconnector) : drm_get_dvi_i_subconnector_name((int)subconnector)); } static ssize_t select_subconnector_show(struct device *device, struct device_attribute *attr, char *buf) { struct drm_connector *connector = to_drm_connector(device); struct drm_device *dev = connector->dev; struct drm_property *prop = NULL; uint64_t subconnector; int is_tv = 0; int ret; switch (connector->connector_type) { case DRM_MODE_CONNECTOR_DVII: prop = dev->mode_config.dvi_i_select_subconnector_property; break; case DRM_MODE_CONNECTOR_Composite: case DRM_MODE_CONNECTOR_SVIDEO: case DRM_MODE_CONNECTOR_Component: case DRM_MODE_CONNECTOR_TV: prop = dev->mode_config.tv_select_subconnector_property; is_tv = 1; break; default: DRM_ERROR("Wrong connector type for this property\n"); return 0; } if (!prop) { DRM_ERROR("Unable to find select subconnector property\n"); return 0; } ret = drm_object_property_get_value(&connector->base, prop, &subconnector); if (ret) return 0; return snprintf(buf, PAGE_SIZE, "%s", is_tv ? drm_get_tv_select_name((int)subconnector) : drm_get_dvi_i_select_name((int)subconnector)); } static struct device_attribute connector_attrs[] = { __ATTR_RO(status), __ATTR_RO(enabled), __ATTR_RO(dpms), __ATTR_RO(modes), }; /* These attributes are for both DVI-I connectors and all types of tv-out. */ static struct device_attribute connector_attrs_opt1[] = { __ATTR_RO(subconnector), __ATTR_RO(select_subconnector), }; static struct bin_attribute edid_attr = { .attr.name = "edid", .attr.mode = 0444, .size = 0, .read = edid_show, }; /** * drm_sysfs_connector_add - add a connector to sysfs * @connector: connector to add * * Create a connector device in sysfs, along with its associated connector * properties (so far, connection status, dpms, mode list & edid) and * generate a hotplug event so userspace knows there's a new connector * available. */ int drm_sysfs_connector_add(struct drm_connector *connector) { struct drm_device *dev = connector->dev; int attr_cnt = 0; int opt_cnt = 0; int i; int ret; if (connector->kdev) return 0; connector->kdev = device_create(drm_class, dev->primary->kdev, 0, connector, "card%d-%s", dev->primary->index, drm_get_connector_name(connector)); DRM_DEBUG("adding \"%s\" to sysfs\n", drm_get_connector_name(connector)); if (IS_ERR(connector->kdev)) { DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev)); ret = PTR_ERR(connector->kdev); goto out; } /* Standard attributes */ for (attr_cnt = 0; attr_cnt < ARRAY_SIZE(connector_attrs); attr_cnt++) { ret = device_create_file(connector->kdev, &connector_attrs[attr_cnt]); if (ret) goto err_out_files; } /* Optional attributes */ /* * In the long run it maybe a good idea to make one set of * optionals per connector type. */ switch (connector->connector_type) { case DRM_MODE_CONNECTOR_DVII: case DRM_MODE_CONNECTOR_Composite: case DRM_MODE_CONNECTOR_SVIDEO: case DRM_MODE_CONNECTOR_Component: case DRM_MODE_CONNECTOR_TV: for (opt_cnt = 0; opt_cnt < ARRAY_SIZE(connector_attrs_opt1); opt_cnt++) { ret = device_create_file(connector->kdev, &connector_attrs_opt1[opt_cnt]); if (ret) goto err_out_files; } break; default: break; } ret = sysfs_create_bin_file(&connector->kdev->kobj, &edid_attr); if (ret) goto err_out_files; /* Let userspace know we have a new connector */ drm_sysfs_hotplug_event(dev); return 0; err_out_files: for (i = 0; i < opt_cnt; i++) device_remove_file(connector->kdev, &connector_attrs_opt1[i]); for (i = 0; i < attr_cnt; i++) device_remove_file(connector->kdev, &connector_attrs[i]); device_unregister(connector->kdev); out: return ret; } EXPORT_SYMBOL(drm_sysfs_connector_add); /** * drm_sysfs_connector_remove - remove an connector device from sysfs * @connector: connector to remove * * Remove @connector and its associated attributes from sysfs. Note that * the device model core will take care of sending the "remove" uevent * at this time, so we don't need to do it. * * Note: * This routine should only be called if the connector was previously * successfully registered. If @connector hasn't been registered yet, * you'll likely see a panic somewhere deep in sysfs code when called. */ void drm_sysfs_connector_remove(struct drm_connector *connector) { int i; if (!connector->kdev) return; DRM_DEBUG("removing \"%s\" from sysfs\n", drm_get_connector_name(connector)); for (i = 0; i < ARRAY_SIZE(connector_attrs); i++) device_remove_file(connector->kdev, &connector_attrs[i]); sysfs_remove_bin_file(&connector->kdev->kobj, &edid_attr); device_unregister(connector->kdev); connector->kdev = NULL; } EXPORT_SYMBOL(drm_sysfs_connector_remove); /** * drm_sysfs_hotplug_event - generate a DRM uevent * @dev: DRM device * * Send a uevent for the DRM device specified by @dev. Currently we only * set HOTPLUG=1 in the uevent environment, but this could be expanded to * deal with other types of events. */ void drm_sysfs_hotplug_event(struct drm_device *dev) { char *event_string = "HOTPLUG=1"; char *envp[] = { event_string, NULL }; DRM_DEBUG("generating hotplug event\n"); kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp); } EXPORT_SYMBOL(drm_sysfs_hotplug_event); static void drm_sysfs_release(struct device *dev) { kfree(dev); } /** * drm_sysfs_device_add - adds a class device to sysfs for a character driver * @dev: DRM device to be added * @head: DRM head in question